Abstract
In studies on Waipahihi sand, a yellow-brown pumice soil of the Taupo suite, 97% or more of sulphate applied as superphosphate or gypsum was leached out under an alternate leaching and drying procedure. Losses were proportional to the amounts applied. They were unaffected by particle size of gypsum over the ranges 16–30, 30–60, and 60–120 mesh (B.S.S.), except in the first leaching.

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